You are getting ready to make a few loafs of bread from your freshly ground wheat and you grab your yeast and see it is a few years old what do you do? You don’t want to waste the food by using bad yeast. It is simple you proof the yeast by mixing a small quantity of yeast with an equal amount of sugar. Add the mixture to warm water (105-115 degrees). Active yeast will begin to expand and become bubbly within five to ten minutes. If this reaction takes longer, you can still use the yeast, but you will need to use more than normal. Yeast that shows no reaction should be discarded.

Active dry yeast should have a shelf life of approximately 2 years at 70 degrees. Keeping it refrigerated should extend the storage life to around 3 to 5 years. Freezing it will extend the storage life, but you should proof a sample before use if it is over a couple of years old..

Red StarYeast states the following. “Each package and jar of dry yeast is stamped with a ‘Best if Used by’ date. This date is two years from the date the yeast was packaged. The month and year reflect when you should use your yeast by.

Unopened packages and jars should be stored in a cool, dry place such as a cupboard; and can also be stored in the refrigerator or freezer. Yeast is very perishable when exposed to air, moisture and/or heat. Once your package or jar is opened the yeast must be refrigerated or frozen in an airtight container (see storage tips below). Under these conditions, we recommend using the Dry Yeast within 4 months after opening if refrigerated, or within 6 months after opening if frozen.

Dry Yeast should be at room temperature before using . When you are ready to bake, take out only the amount of yeast needed for your recipe and let it sit at room temperature for 30-45 minutes before using. Immediately put remaining yeast back into storage, following the storage tips below.

Yeast is a living organism, and will lose activity over time – even if the package is unopened. If you are unsure of your yeast’s activity, perform the Yeast Freshness Test before using.

DRY YEAST STORAGE TIPS

To prepare your dry yeast open packages for refrigerated or frozen storage:

Fold the package down to yeast level (this removes the extra air).

Seal with some tape or a clip before putting into storage.

If you have a large opened package, separate dry yeast into multiple zipper bags and push out any air before sealing.